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| author | James Hogan <james.hogan@imgtec.com> | 2012-10-09 11:00:24 +0100 |
|---|---|---|
| committer | James Hogan <james.hogan@imgtec.com> | 2013-03-02 20:09:50 +0000 |
| commit | 6006c0d8ce9441dd1363bf14f18a8e28d3588460 (patch) | |
| tree | 786183053c89e11b3058b8a16f7953744b819340 /Documentation | |
| parent | 9b802d1f43978869fcd98e92b854fd8785cefee7 (diff) | |
| download | linux-6006c0d8ce9441dd1363bf14f18a8e28d3588460.tar.bz2 | |
metag: Atomics, locks and bitops
Add header files to implement Meta hardware thread locks (used by some
other atomic operations), atomics, spinlocks, and bitops.
There are 2 main types of atomic primitives for metag (in addition to
IRQs off on UP):
- LOCK instructions provide locking between hardware threads.
- LNKGET/LNKSET instructions provide load-linked/store-conditional
operations allowing for lighter weight atomics on Meta2
LOCK instructions allow for hardware threads to acquire voluntary or
exclusive hardware thread locks:
- LOCK0 releases exclusive and voluntary lock from the running hardware
thread.
- LOCK1 acquires the voluntary hardware lock, blocking until it becomes
available.
- LOCK2 implies LOCK1, and additionally acquires the exclusive hardware
lock, blocking all other hardware threads from executing.
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Diffstat (limited to 'Documentation')
0 files changed, 0 insertions, 0 deletions